Authors

Abstract

In order to solve the problems of small feeding amount, high manual labor intensity and low work efficiency of the existing straw crusher, a large straw crusher with cylinder feeding hammer is designed. The key parts of the machine are designed and calculated, and the mechanism of corn straw crushing in the crusher is analyzed, and the theoretical factors affecting the working effect of the crusher are obtained. With the rotation speed of crushing shaft, diameter of sieve and clearance of sieve-hammer as test factors, and the productivity, qualification rate of crushing length as performance evaluation indicators, a quadratic regression orthogonal rotation combination test with three factors and five levels was carried out. The regression mathematical model of test factors and performance evaluation indicators was established by using Design-Expert 13.0 software. With the goal of simultaneously maximizing the qualified rate of productivity and crushing length, multi-objective optimization solutions were carried out for the rotation speed of crushing shaft, diameter of sieve and clearance of sieve-hammer, and the optimal parameter combination was determined as follows: The rotation speed of crushing shaft is 1709.24r/min, the diameter of sieve is 22.83mm, the clearance of sieve-hammer is 15.38mm, the verification test shows that the productivity is 9187.98kg/h, and the qualification rate of crushing length is 93.87%. The machine improves the efficiency of crushing operation and can meet the design requirements.

Abstract in Chinese

为解决现有的饲草粉碎机喂入量小，人工劳动强度大，工作效率低等问题，设计了一种圆筒喂料锤片式大型秸秆粉碎机。对该机的关键部件进行了设计计算，并对玉米秸秆在粉碎机内的粉碎机理进行了分析，得到了影响粉碎机工作效果的理论因素。以粉碎轴转速、筛孔直径、筛锤间隙为试验因素，以生产率、粉碎长度合格率为性能评价指标，进行三因素五水平二次回归正交旋转组合试验，利用Design-Expert 13.0软件对试验结果进行方差分析，建立了试验因素与性能评价指标的回归数学模型。以生产率和粉碎长度合格率同时最大化为目标，对粉碎轴转速、筛孔直径、筛锤间隙进行多目标寻优求解，确定了最优参数组合为：粉碎轴转速1709.24r/min、筛孔直径22.83mm、筛锤间隙15.38mm，验证试验表明，生产率9187.98kg/h、粉碎长度合格率93.87%。该机提高了粉碎作业效率，能够满足设计要求。